Single sludge denitrification in recirculating aquaculture systems effects of pre fermentation and ph

Single-sludge denitrification in recirculating aquaculture systems: effects of prefermentation and pH - DTU Orbit (08/11/2017)
Single-sludge denitrification in recirculating aquaculture systems: effects of pre-fermentation and pH
Single-sludge denitrification (DN) reactors in aquaculture use the carbonous solid fish waste produced in the system to
reduce the discharged nitrate load. The solid waste is available for denitrifiers when present in soluble, readily
biodegradable form, and the transformation is accomplished by bacterial hydrolysis and fermentation. The objective of this
study was to quantify the effect of pre-fermentation of solid fish waste on single-sludge DN reactor efficiency. Prefermentation times tested were 0 d (no pre-fermentation), 1 d, 5 d, and 10 d, and the efficiency was quantified as the
potential DN rate obtained in laboratory assays. Results showed that the highest DN rate was achieved with 1 d prefermentation. The volumetric DN rates measured in decreasing order were 23.4 +/- 0.00 mg NO3-N L-1 h(-1) (1 d), 20.5
+/- 0.35 mg NO3-N L-1 h(-1) (5 d), 17.0 +/- 0.47 mg NO3-N L-1 h(-1) (10 d), and 14.2 +/- 0.24 mg NO3-N L-1 h(-1) (0 d). It
was suspected that the poor utilization of soluble COD (sCOD) in the 5 d and 10 d pre-fermentation treatments was due to
the low starting pH (pH <7). Subsequently, the experiments were repeated in 0.1 M HEPES buffer (pH = 7.1) and showed
a clear correlation between specific DN rate and sCOD content. Overall, the highest increase in potential specific DN rate
was achieved by applying pre-fermentation; e.g., from 0 d to 1 d, the increase was 123% and 106% at unadjusted pH and
pH 7.1, respectively. An additional 20% increase was achieved at pH 7.1 by prolonging the pre-fermentation time to 5 d.
General information
State: Published
Organisations: National Institute of Aquatic Resources, Section for Aquaculture, Department of Environmental Engineering
, Water Technologies
Authors: Suhr, K. I. (Intern), Letelier-Gordo, C. O. (Intern), Prat Busquets, P. (Intern)
Pages: 1825-1831
Publication date: 2015
Main Research Area: Technical/natural sciences
Publication information
Journal: American Society of Agricultural and Biological Engineers. Transactions
Volume: 58
Issue number: 6
ISSN (Print): 2151-0032
Ratings: 
BFI (2017): BFI-level 1
Web of Science (2017): Indexed Yes
BFI (2016): BFI-level 1
Scopus rating (2016): SJR 0.444 SNIP 0.824 CiteScore 1.29

BFI (2015): BFI-level 1
Scopus rating (2015): SJR 0.749 SNIP 1.022 CiteScore 1.63
Web of Science (2015): Indexed yes
BFI (2014): BFI-level 1
Scopus rating (2014): SJR 0.615 SNIP 0.985 CiteScore 1.23
BFI (2013): BFI-level 1
Scopus rating (2013): SJR 0.629 SNIP 0.901 CiteScore 1.26
BFI (2012): BFI-level 1
Scopus rating (2012): SJR 0.649 SNIP 0.964 CiteScore 1.26
BFI (2011): BFI-level 1
Scopus rating (2011): SJR 0.629 SNIP 0.934 CiteScore 1.3
BFI (2010): BFI-level 1
Scopus rating (2010): SJR 0.676 SNIP 0.873
BFI (2009): BFI-level 1
Scopus rating (2009): SJR 0.691 SNIP 0.825
BFI (2008): BFI-level 1
Scopus rating (2008): SJR 0.709 SNIP 0.908
Scopus rating (2007): SJR 0.643 SNIP 0.975
Scopus rating (2006): SJR 0.788 SNIP 1.007
Scopus rating (2005): SJR 0.727 SNIP 1.167
Scopus rating (2004): SJR 0.782 SNIP 1.137
Scopus rating (2003): SJR 0.715 SNIP 0.971
Scopus rating (2002): SJR 0.645 SNIP 0.947


Scopus rating (2001): SJR 0.555 SNIP 1.049
Scopus rating (2000): SJR 0.619 SNIP 1.049
Scopus rating (1999): SJR 0.808 SNIP 1.095
Original language: English
Aquaculture, Denitrification, Nitrate removal, Single-sludge denitrification, Sludge hydrolysis, Sludge prefermentation

DOIs: 
10.13031/trans.58.10952
Source: FindIt
Source-ID: 2290397094
Publication: Research - peer-review › Journal article – Annual report year: 2016